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板凳
楼主 |
发表于 2018-12-14 17:29:27
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我倒是知道需要编写驱动,主要问题还是地址的映射问题,就是在驱动里面如何来实现地址的调用,我看你们的LED驱动程序里面也没有相关的地址调用问题啊,如下列的你们提供的源码所示:1 [5 K. M" }0 t2 [1 _/ v
#include <linux/module.h>
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3 q( I* L: M3 s4 [" E#include <linux/kernel.h>+ G& T' k q- V% G/ B' l
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#include <linux/types.h>
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1 |$ Y- v' B9 B- B#include <linux/gpio.h>
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#include <linux/leds.h>) A. j: ]- C& T5 j
" {$ V0 Y2 x! P* X# n" M#include <linux/platform_device.h>
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* K9 ~# c) [, i. g2 W) o#include <asm/mach-types.h>
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#include <asm/mach/arch.h>
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#include <mach/da8xx.h>
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#include <mach/mux.h>
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6 y( b4 P0 H+ C9 r W#define DA850_USER_LED0 GPIO_TO_PIN(0, 0): u, Z7 B' n+ h8 ]
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#define DA850_USER_LED1 GPIO_TO_PIN(0, 5)# T$ \, Z# X: c" F# Q* S2 \
. V: L4 O( G6 U/ O4 `2 l& f9 }; K f#define DA850_USER_LED2 GPIO_TO_PIN(0, 1)
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#define DA850_USER_LED3 GPIO_TO_PIN(0, 2)
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#define DA850_USER_LED4 GPIO_TO_PIN(6,12)& C7 R) o9 L% n7 U' ?9 \4 U
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#define DA850_USER_LED5 GPIO_TO_PIN(6,13)/ x! L4 D- A @
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6 f: E* u4 l' U2 k/* assign the tl som board LED-GPIOs*/ W9 l' G) Q4 z3 a; M7 H6 {
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static const short da850_evm_tl_user_led_pins[] = {
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/* These pins are definition at <mach/mux.h> file */# k7 Z4 q3 X1 W" S; Y) T5 a
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DA850_GPIO0_0, DA850_GPIO0_1, DA850_GPIO0_2, DA850_GPIO0_5,DA850_GPIO6_12,DA850_GPIO6_13,) X( c& b7 y. Y
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-1
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static struct gpio_led da850_evm_tl_leds[] = {. {4 O- S) ?$ A3 E! q# `1 h
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5 T E' P& X# i4 n, m5 b .active_low = 0,& m% j6 Z: |0 Y8 N( @
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.gpio = DA850_USER_LED0,, z4 T: @* a3 V
% p+ |4 n3 W, Q1 o .name = "user_led0",
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.default_trigger = "default-on",) S% y! o9 \8 X
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.active_low = 0,* q, L5 ] P$ l
- R& V( @+ C% t8 f g/ R4 d .gpio = DA850_USER_LED1,
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: h( X( I! q: Z i .name = "user_led1",. c- x* ~7 K0 g1 \8 P0 k, d! k
}! X& T5 F2 G3 ]" I8 D7 k0 ` .default_trigger = "default-on",
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},
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7 Y2 A7 b5 `" _- I6 l6 p .active_low = 0,) }5 x6 x' m& A+ u3 X# J2 C
, n4 S. y: Z' A! x+ A: f- ~$ I8 D .gpio = DA850_USER_LED2,
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.name = "user_led2",$ h0 t0 H: t0 C8 A3 a& b
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.default_trigger = "default-on",* w1 h+ _1 f$ ` S, d& k5 }
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},
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.active_low = 0,
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9 B" U( @3 M; j; c, I1 m" k .gpio = DA850_USER_LED3,
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.name = "user_led3",: d& z5 h4 b- K" Z1 z
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.default_trigger = "default-on",
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: ~4 G4 Y2 z* K1 z .active_low = 0,
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.gpio = DA850_USER_LED4,
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.name = "user_led4",
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.default_trigger = "default-on",; M" U4 \3 `* X8 j6 z4 Y
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{
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, ~! s& t4 P1 O. W8 o .active_low = 0,
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6 m$ n' L( n. e6 e .gpio = DA850_USER_LED5,
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2 l0 U8 ]4 {0 T .name = "user_led5",
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' j6 h# `4 s8 f( M% N5 \ .default_trigger = "default-on",
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},
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};& C# ^2 _# i$ A5 J' q# u7 a
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static struct gpio_led_platform_data da850_evm_tl_leds_pdata = {
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.leds = da850_evm_tl_leds,$ _) b. M) f7 ?: o
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.num_leds = ARRAY_SIZE(da850_evm_tl_leds),
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static void led_dev_release(struct device *dev)5 I4 {" b( h4 B N5 B( f; g8 c
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- h8 V Y) R Y5 Fstatic struct platform_device da850_evm_tl_leds_device = {
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.name = "leds-gpio",
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.id = 1,
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5 q) q: @2 }( \: Y+ G .dev = {, {/ j+ y) }$ S; u3 X
& r) U6 m# |1 v) v+ T9 X .platform_data = &da850_evm_tl_leds_pdata,
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.release = led_dev_release,
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}
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static int __init led_platform_init(void)' [2 [( C5 S) \& L3 E V
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{
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int ret;
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#if 0" [. `4 Z" B8 Z3 @
" x6 ~+ ]' j8 \% D6 ?$ F ret = davinci_cfg_reg_list(da850_evm_tl_user_led_pins);
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if (ret)
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pr_warning("da850_evm_tl_leds_init : User LED mux failed :"8 p0 \& T( @4 b1 ^
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"%d\n", ret);
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#endif2 ^% l# Y" U% i9 Y; U7 K8 l
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ret = platform_device_register(&da850_evm_tl_leds_device);& s. i6 K% I: A
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if (ret)& a0 b+ o5 c! Z& M a+ I3 f( ~+ t
( q' m% M( ?7 ^* _2 ` pr_warning("Could not register som GPIO expander LEDS");
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printk(KERN_INFO "LED register sucessful!\n");
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return ret;, P, q' N5 Z& a$ t* C) A
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static void __exit led_platform_exit(void)+ ]4 x* J+ u1 V6 }( |- ]# j$ J
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{
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# v4 A6 s3 B5 F i2 Z platform_device_unregister(&da850_evm_tl_leds_device);) I7 A1 r# A: W% R" E% ^
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3 H% _* |/ o( ]8 m& f3 R printk(KERN_INFO "LED unregister!\n");) g4 B7 g u! b
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$ v, E' m6 X) S% Xmodule_init(led_platform_init);
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, k, T5 y U7 D0 u$ N3 {) D5 W6 o2 rmodule_exit(led_platform_exit);
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MODULE_DESCRIPTION("Led platform driver");
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}( A5 ^3 b: r7 [0 i2 d& AMODULE_AUTHOR("Tronlong");* O' k8 R. o/ d" ]" s+ v! Z
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MODULE_LICENSE("GPL"); |
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